linux-kernel - Re: [PATCH] mmc: pxamci: fix enum type confusion

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Date:   Thu, 7 Mar 2019 08:20:29 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Daniel Mack <daniel@...que.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: pxamci: fix enum type confusion

On Thu, Mar 07, 2019 at 11:09:19AM +0100, Arnd Bergmann wrote:
> clang points out several instances of mismatched types in this drivers,
> all coming from a single declaration:
> 
> drivers/mmc/host/pxamci.c:193:15: error: implicit conversion from enumeration type 'enum dma_transfer_direction' to
>       different enumeration type 'enum dma_data_direction' [-Werror,-Wenum-conversion]
>                 direction = DMA_DEV_TO_MEM;
>                           ~ ^~~~~~~~~~~~~~
> drivers/mmc/host/pxamci.c:212:62: error: implicit conversion from enumeration type 'enum dma_data_direction' to
>       different enumeration type 'enum dma_transfer_direction' [-Werror,-Wenum-conversion]
>         tx = dmaengine_prep_slave_sg(chan, data->sg, host->dma_len, direction,
> 
> The behavior is correct, so this must be a simply typo from
> dma_data_direction and dma_transfer_direction being similarly named
> types with a similar purpose.
> 
> Fixes: 6464b7140951 ("mmc: pxamci: switch over to dmaengine use")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>

> ---
>  drivers/mmc/host/pxamci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
> index c907bf502a12..c1d3f0e38921 100644
> --- a/drivers/mmc/host/pxamci.c
> +++ b/drivers/mmc/host/pxamci.c
> @@ -162,7 +162,7 @@ static void pxamci_dma_irq(void *param);
>  static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
>  {
>  	struct dma_async_tx_descriptor *tx;
> -	enum dma_data_direction direction;
> +	enum dma_transfer_direction direction;
>  	struct dma_slave_config	config;
>  	struct dma_chan *chan;
>  	unsigned int nob = data->blocks;
> -- 
> 2.20.0
>